The electricity cost of agricultural irrigation and drainage in the Dahe Ex- periment Station was analyzed. The results showed that from 2012 to 2016, the annual total power and total electricity cost increased year b...The electricity cost of agricultural irrigation and drainage in the Dahe Ex- periment Station was analyzed. The results showed that from 2012 to 2016, the annual total power and total electricity cost increased year by year. The higher the electricity consumption was, the lower the factor adjusted power price was. The an- nual factor adjusted power price decreased from 532.5 yuan （above the national standard） to -599.78 yuan （below the national standard）. The electricity consumption was always highest in June. The more the rainfall from June to September was, the less the monthly electricity usage was. The collect electricity charge to total electricity charge ratio was 1.26%-1.34%, the directory electricity charge to total electricity charge ratio was 96.34%-99.80%, and the electricity loss of transformer was 288-496 kW/h.展开更多
Analysis of the spatial variability of soil properties is important to arrange the experimental treatments in the experimental station. This paper aims to study the spatial structure of soil variables and their distri...Analysis of the spatial variability of soil properties is important to arrange the experimental treatments in the experimental station. This paper aims to study the spatial structure of soil variables and their distribution in the Pengshui tobacco experiment station in Chongqing, China. Soil samples were taken from 289 soil points on 20 m grid in March 2012. Twenty-two soil chemical and physical properties were analyzed by classical statistical and geo-statistical methods. Soil pH, cation exchange capacity （CEC）, total phosphorus （TP）, available phosphorus （AP）, zinc （Zn）, magnesium （Mg） and sulphur （S） have the strong spatial dependence, with nugget/sill ratios of less than 25%. The others have the moderate dependence with nugget/sill ratios of 26.17% to 71.04%. Ranges of the spatial correlation varied from 51.30 m for chlorine （C1） to 594.90 m for TP. The clearly patchy maps of the nutrients showed the spatial distributions of the soil variables, which can be used for better management of experimental treatments, achieving reliable exoerimental results in the tobacco exnerimental station.Highlight： Scientific experimentation assumes the existence of random variability for soil attributes. This research was to evaluate the spatial variability of soil chemical and physical attributes and to interpolate the spatial distribution of soil properties in the tobacco experimental station in Chongqing. The result of this work can be used for the agricultural management of tobacco cultivation.展开更多
Guangdong Province is one of the provinces in China with the best modern agricultural industry and the highest production efficiency.While Jiangmen City,one of the agriculture-based cities in Guangdong Province,has ma...Guangdong Province is one of the provinces in China with the best modern agricultural industry and the highest production efficiency.While Jiangmen City,one of the agriculture-based cities in Guangdong Province,has made active exploration in building a modern agricultural system.China has established cooperation with the four largest agricultural research institutes in China to offer technical support for the development of modern agriculture.In this paper,the status quo and existing problems of agricultural development in Jiangmen,Guangdong are briefly introduced.Then,the cooperation status and prospect of local government with the research institutes are discussed.Finally some suggestions are given on the agricultural development pattern in Jiangmen City.展开更多
This paper introduces the origin and progress of Tropical and South Subtropical Agricultural Comprehensive Experimental Station( hereinafter referred to as experimental station) CATAS( Jiangmen),formulates the thought...This paper introduces the origin and progress of Tropical and South Subtropical Agricultural Comprehensive Experimental Station( hereinafter referred to as experimental station) CATAS( Jiangmen),formulates the thought for construction of experimental station,analyzes the restrictive factors and puts forward corresponding countermeasures in order to provide reference for the decision- making and implementation of constructing the experimental station.展开更多
Location & natural conditions: the station is situated in Shilihe township under the jurisdiction of the south District of Sujiatun and 35 kilometers from downtown Shenyang, capital of Liaoning Province. Its locat...Location & natural conditions: the station is situated in Shilihe township under the jurisdiction of the south District of Sujiatun and 35 kilometers from downtown Shenyang, capital of Liaoning Province. Its location is 41°32′N and 123°23′E, with an average elevation of 31 meters and a mean annual temperature of 7°-8°, reaching 39.3℃ in summer and -33.1°in winter. The annual precipitation is about 700 mm and the frost-free period is 147-164 days per year. Its surroundings are covered by fertile meadow chernozem soil with a flat terrain suitable for agriculture.展开更多
Location & environmental features: Donghu Lake is located at 114°23′ E and 30°33′N in the eastern suburbs of the city of Wuhan, capital of Hubei Province in central China. It is a typical shallow-botto...Location & environmental features: Donghu Lake is located at 114°23′ E and 30°33′N in the eastern suburbs of the city of Wuhan, capital of Hubei Province in central China. It is a typical shallow-bottomed, freshwater ecosystem nestling in the middle reaches of the mighty Changjiang (Yangtze) River. With a total surface area of 27.8 square and a mean depth of 2.2 meters, it sprawls in a drainage basin covering an area of 187 square kilometers. The station is situated on the southwest bank of the lake.展开更多
复合绝缘子伞形结构对其周围流场特性有明显的影响,从而导致其覆冰特性存在差异。为此,分别在人工气候室和自然覆冰试验站对多种伞形结构220 k V复合绝缘子进行了人工模拟和自然现场覆冰试验研究,分析了伞形结构对其覆冰增长特性的影响...复合绝缘子伞形结构对其周围流场特性有明显的影响,从而导致其覆冰特性存在差异。为此,分别在人工气候室和自然覆冰试验站对多种伞形结构220 k V复合绝缘子进行了人工模拟和自然现场覆冰试验研究,分析了伞形结构对其覆冰增长特性的影响规律,结果表明:随着覆冰程度的增大,冰棱根数逐渐减少,冰棱长度和直径、伞面冰厚和覆冰重量均逐渐增大但增速变慢;伞裙直径增大时,覆冰增长较快,而伞间距增大时,冰棱长度、伞面冰厚和覆冰重量均逐渐变大但冰棱直径变小;在重度覆冰条件下,伞形结构的影响已不明显;自然覆冰条件下,伞形结构对绝缘子覆冰增长的影响规律与人工模拟试验结果基本一致。展开更多
文摘The electricity cost of agricultural irrigation and drainage in the Dahe Ex- periment Station was analyzed. The results showed that from 2012 to 2016, the annual total power and total electricity cost increased year by year. The higher the electricity consumption was, the lower the factor adjusted power price was. The an- nual factor adjusted power price decreased from 532.5 yuan （above the national standard） to -599.78 yuan （below the national standard）. The electricity consumption was always highest in June. The more the rainfall from June to September was, the less the monthly electricity usage was. The collect electricity charge to total electricity charge ratio was 1.26%-1.34%, the directory electricity charge to total electricity charge ratio was 96.34%-99.80%, and the electricity loss of transformer was 288-496 kW/h.
文摘Analysis of the spatial variability of soil properties is important to arrange the experimental treatments in the experimental station. This paper aims to study the spatial structure of soil variables and their distribution in the Pengshui tobacco experiment station in Chongqing, China. Soil samples were taken from 289 soil points on 20 m grid in March 2012. Twenty-two soil chemical and physical properties were analyzed by classical statistical and geo-statistical methods. Soil pH, cation exchange capacity （CEC）, total phosphorus （TP）, available phosphorus （AP）, zinc （Zn）, magnesium （Mg） and sulphur （S） have the strong spatial dependence, with nugget/sill ratios of less than 25%. The others have the moderate dependence with nugget/sill ratios of 26.17% to 71.04%. Ranges of the spatial correlation varied from 51.30 m for chlorine （C1） to 594.90 m for TP. The clearly patchy maps of the nutrients showed the spatial distributions of the soil variables, which can be used for better management of experimental treatments, achieving reliable exoerimental results in the tobacco exnerimental station.Highlight： Scientific experimentation assumes the existence of random variability for soil attributes. This research was to evaluate the spatial variability of soil chemical and physical attributes and to interpolate the spatial distribution of soil properties in the tobacco experimental station in Chongqing. The result of this work can be used for the agricultural management of tobacco cultivation.
基金Supported by the Special Fund for the Construction of Modern Agricultural Technical System(CARS-12-gdqxd)the Special Foundation for the Basic Scientific Research of Central Public Welfare Institute(1630032013033)
文摘Guangdong Province is one of the provinces in China with the best modern agricultural industry and the highest production efficiency.While Jiangmen City,one of the agriculture-based cities in Guangdong Province,has made active exploration in building a modern agricultural system.China has established cooperation with the four largest agricultural research institutes in China to offer technical support for the development of modern agriculture.In this paper,the status quo and existing problems of agricultural development in Jiangmen,Guangdong are briefly introduced.Then,the cooperation status and prospect of local government with the research institutes are discussed.Finally some suggestions are given on the agricultural development pattern in Jiangmen City.
文摘This paper introduces the origin and progress of Tropical and South Subtropical Agricultural Comprehensive Experimental Station( hereinafter referred to as experimental station) CATAS( Jiangmen),formulates the thought for construction of experimental station,analyzes the restrictive factors and puts forward corresponding countermeasures in order to provide reference for the decision- making and implementation of constructing the experimental station.
文摘Location & natural conditions: the station is situated in Shilihe township under the jurisdiction of the south District of Sujiatun and 35 kilometers from downtown Shenyang, capital of Liaoning Province. Its location is 41°32′N and 123°23′E, with an average elevation of 31 meters and a mean annual temperature of 7°-8°, reaching 39.3℃ in summer and -33.1°in winter. The annual precipitation is about 700 mm and the frost-free period is 147-164 days per year. Its surroundings are covered by fertile meadow chernozem soil with a flat terrain suitable for agriculture.
文摘Location & environmental features: Donghu Lake is located at 114°23′ E and 30°33′N in the eastern suburbs of the city of Wuhan, capital of Hubei Province in central China. It is a typical shallow-bottomed, freshwater ecosystem nestling in the middle reaches of the mighty Changjiang (Yangtze) River. With a total surface area of 27.8 square and a mean depth of 2.2 meters, it sprawls in a drainage basin covering an area of 187 square kilometers. The station is situated on the southwest bank of the lake.
文摘复合绝缘子伞形结构对其周围流场特性有明显的影响,从而导致其覆冰特性存在差异。为此,分别在人工气候室和自然覆冰试验站对多种伞形结构220 k V复合绝缘子进行了人工模拟和自然现场覆冰试验研究,分析了伞形结构对其覆冰增长特性的影响规律,结果表明:随着覆冰程度的增大,冰棱根数逐渐减少,冰棱长度和直径、伞面冰厚和覆冰重量均逐渐增大但增速变慢;伞裙直径增大时,覆冰增长较快,而伞间距增大时,冰棱长度、伞面冰厚和覆冰重量均逐渐变大但冰棱直径变小;在重度覆冰条件下,伞形结构的影响已不明显;自然覆冰条件下,伞形结构对绝缘子覆冰增长的影响规律与人工模拟试验结果基本一致。
